Does wind wall block hecarim ultimate?

I had a game yesterday where there was a Yasuo support. Anyways, I was playing hecarim jungle and ganked Yasuo/vayne bot Lane. They were both low health and I ulted down towards the bush, they ran in to the bush and threw up wind wall right outside the bush. Hecarim stopped outside the bush (even though I'm certain I clicked inside it) so I didn't have vision inside to see if the fear hit or not, but it seemed the damage didn't hit as Yasuo was quite low to begin with and wasn't killed by the ultimate.

I would think the ultimate is not a projectile and shouldn't be blocked, but aside from potentially the fear, it seemed that the spectral riders and hecarim himself were both blocked by the wall. It wouldn't be impossible to consider the riders a projectile (even though they shouldn't be) but hecarim is definitely not a projectile and shouldn't have been blocked by the wall? I'll need to keep an eye on my ultimates on Yasuo to see what happens (would help if there wasn't a Bush) but if anyone knows for sure I'd like to know.

Thanks!